What, Yaguchi and Ishikawa are somehow significantly more popular than Nacchi? Bitch, please.. Nacchi's singles may not be selling but Yaguchi's not even releasing shit... And it's not like Ayaya hasn't fallen a lot in popularity, too...
I was going more for non-H!P fans. Yaguchi isn't associated much with H!P anymore besides concert MC/random concert appearances/Uta-doki. Ishikawa seems to be more popular outside of H!P than Nacchi for whatever reason. Ayaya has fallen a lot in popularity as has everyone else in H!P, but Nacchi, to me, seems to have fallen the most of all the featured soloists. Ayaya has always had more outside fans. They both are getting fewer TV appearances, but I hardly ever see Nacchi in anything that's not entirely H!P related. The ones who seem to be getting the most TV appearances not as a group are (kinda sorta)Okada and Ongaku Gatas non-egg girls (minus Korenaga). And Yaguchi's not releasing anything, which could make it sell more, just for the fact that she hasn't released anything, which is why I mentioned her.
And shirenu, I know you're a Nacchi fangirl, but seriously, I hardly ever see anything Nacchi related anymore. She used to randomly appear on shows much like Satoda (even Okada to a point) are doing now, but lately, I don't know when I last saw her doing anything. Yaguchi and Ayaya are slowing hitting that road, but Nacchi seems to have just dropped off, to me. I see more MKB stuff on trackers weekly than I do with Nacchi monthly. Not saying she's less popular than them, but she had her spotlight time, and it's definitely not around anymore, whether it's her scandals or her age, or what... I don't know.